Perform single - arm variations of your favorite dumbbell pressing exercise, like the dumbbell bench press. (t-nation.com)
Several different arm variations are available in this fold, however the most effective that I have felt is with the arms up and behind the spine. (onnit.com)
Adding the resistance band takes away that limitation and allows for the overhead arm variation to be accessible to even the most tight of shoulders! (onnit.com)